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Earlier this month, HTC announced Android 6.0 Marshmallow update for some of its premium devices including the HTC One M8 and HTC One M9. However, now the AT&T carrier has released the stock RUU firmware file for the same. Yes, the HTC website has officially displayed the AT&T firmware files for AT&T HTC one M9 and the M8 devices. This is a good news for those who were having trouble updating their devices over the air or have not yet received a FOTA HTC upgrade notification. The RUU for the AT&T M8 weighs around 1.6 GB and that for the M9 weighs a whopping 2.2 GB. This HTC maintenance release firmware come with the build number 3.38.502.12 for the HTC One M9 and the firmware version 6.20.502.5 for the M8. These RUU will restore your device to full stock firmware and restore the device to OEM. You will lose all the changes made to your device like root, custom recovery and also wipe the data, app, etc. Hence, it is highly recommended to backup if you want to install the RUU. If you want the OTA update, navigate to the Home screen then tap All apps > Settings > About and locate the Software version. If your Software number is less than the listed one then you should proceed with the upgrade.

We have already seen similar updates for the T-Mobile HTC One M8 and M9, Sprint and Verizon as well. The firmware upgrade brings the latest Marshmallow goodies like the Doze-Mode, App Permissions, Emojis, and not to forget the new Sense 7 UI from HTC. So grab the update from the download section below and follow the tutorial from below.

Download AT&T HTC One M8 RUU Marshmallow Firmware

AT&T HTC One M8 Maintenance Release v6.20.502.5
Download | File: RUU_M8_UL_M60_SENSE70_ATT_MR_Cingular_US_6.20.502.5.exe [1.52 GB]

Download AT&T HTC One M9 RUU Marshmallow Firmware

AT&T HTC One M9 Maintenance Release v3.38.502.12
Download | File: RUU_HIMA_UL_M60_SENSE70_ATT_MR_Cingular_US_3.38.502.12.exe [2.2 GB]

 

How to Install Stock RUU Firmware file on AT&T HTC One M8 and One M9

Download the full firmware RUU.exe files for our device and transfer to your PC. Connect HTC device to PC and run the RUU.exe file and follow the instructions. It is a full firmware and will perform a clean installation. Hence, you will need to backup everything before flashing the firmware. During the upgrade process, the device will reboot multiple times and show software upgrade screens. Do not remove the USB as this might stop the update and your device may be rendered inoperable. Visit the installation page for the HTC One M9 device from below for the full tutorial and total 3 methods to install it: How to Install  RUU EXE File on HTC One M9 and M8 and upgrade to Marshmallow. Also, if you happen to have the OTA or TWRP flashable firmware file, the check out this tutorial: Install Official HTC One Marshmallow OTA Update Using TWRP And Stock Recovery.

What’s New with AT&T HTC Android 6.0.1 Marshmallow Update?

  • · System update to Android 6.0 Marshmallow
  • · App permissions: lets you define what you want to share and turn permission off anytime.
  • · Now on Tap: gives you access to additional information whilst on your active screen.
  • · Smarter power management: Doze, a battery optimization feature.
  • · Android Security update: improving device on board security.

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